DYNAMIC BEHAVIOR OF VARIABLE WATER VOLUME HVAC SYSTEM

摘要

The dynamic models of variable water volume(VWV) HVAC system are established in this paper.The models including room’s thermal balance anddynamic behavior of HVAC system are used topredict the effect of inlet air temperature, air flowrate, and inlet chilled water temperature on the roomtemperature accurately. During closed loop control ofoutput air temperature, chilled water flow rate is usedas a control input. Variable water volume (VWV) iscontrol by fuzzy adaptive control (FA) combinedwith proportional integral derivative (PID) controlalgorithms (FA-PID). Computational simulations oftwo different control algorithms PID and FA-PIDcontrol are carried out in toolbox Simulink of Matlab.The fuzzy parameters are carefully tuned to controlindoor parameters with less oscillatory responses.The results show that the system based on FA-PIDcontrol is capable of controlling the disturbanceefficiently with less time lag and small error than PIDcontrol.